The Embryo Storage: Nu(エンブリオストレージ·ニューEnburio Sutorēji: Nyū) units, known also simply as Es-N(エス·ニューEsu-Nyū) or just Nu(ニューNyū), are eight antagonists in XBlaze – Code: Embryo. They are mindless artificial beings who answer only to Sōichirō Unomaru, their creator. The ninth Es-N, a minor support character, was in development at the time of her sister units and creator's death; she was adopted by Mei Amanohokosaka.